Thursday, July 23, 2020

Python File next() Method



Hello guys! Welcome back to another section of my tutorial on Python. In this tutorial guide, we are going to be discussing about Python File next() method.

The Python file next() method is used when a file is used as an iterator, typically in a loop, the next() method is been called repeatedly. This method returns the next input line or raises StopIteration when EOF is hit.

Combining next() method with other file methods like readline() does not work right. However, using seek() in repositioning the file to an absolute position is going to flush the read-ahead buffer.

Syntax

The following below is the syntax for Python File next() method -

fileObject.next( );


Parameter Details

  • NA

Return Value

It returns the next input line.

Example

The following below is a simple example -

This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line

#!/usr/bin/python

# Open a file
fo = open("foo.txt", "rw+")
print "Name of the file: ", fo.name

# Assuming file has following 5 lines
# This is 1st line
# This is 2nd line
# This is 3rd line
# This is 4th line
# This is 5th line

for index in range(5):
   line = fo.next()
   print "Line No %d - %s" % (index, line)

# Close opend file
fo.close()

Output
When the above code is executed, it will produce the following result -

Name of the file:  foo.txt
Line No 0 - This is 1st line

Line No 1 - This is 2nd line

Line No 2 - This is 3rd line

Line No 3 - This is 4th line

Line No 4 - This is 5th line


Alright guys! This is where we are rounding up for this tutorial post. In my next tutorial, we are going to be studying about the Python File read Method.

Feel free to ask your questions where necessary and i will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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Thanks for reading and bye for now.
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